<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .father{
            position: relative;
            width: 200px;
            height: 180px;
            background-color: skyblue;
            border: 2px solid red;
            padding: 5px;
            margin: 150px;
        }
        .son{
            width: 100px;
            height: 100px;
            background-color: purple;
            margin-left: 45px;
        }

        .janna{
            height: 200px;
            background-color: skyblue;
            margin: 0 auto 200px;
            padding: 10px;
            border: 15px solid red;
            /* width: 300px; */
        }
    </style>
</head>
<body>
    <div class="father">father
        <div class="son">son</div>
    </div>
    <div class="janna">娜迦</div>


    <script>
        /* 
            轮播图的移动：当前距离 + 若干像素，重新赋值

            offset  抵消，弥补， 补偿 

            1. offsetLeft：元素左侧的偏移量
            2. offsetTop： 元素上侧的偏移量
            3. offsetLeft， offsetTop  是以父级为参考物，父级必须有定位，否则就是 body 为参考系 
            4. 没有  右侧和下侧的 偏移量

            5. offsetWidth = Width + border + padding 
            6. offsetHeight = height + border + padding
            7. offsetWidth 可以动态的获取元素的尺寸
            8. offsetParent 获取有父级定位的元素节点
        */

        let father=document.querySelector('.father');
        let son=document.querySelector('.son');

        console.log(father.offsetLeft); // 150
        console.log(father.offsetTop);  //  150 
        console.log('------son-----------------------');
        console.log(son.offsetLeft);  //  50
        console.log(son.offsetTop);   //  26
        
        console.log(father.offsetWidth);  //  214 
        console.log(father.offsetHeight);  // 194

        console.log('-------------janna----------------');
        let janna=document.querySelector('.janna');
        console.log(janna.offsetWidth);  // 1519 

        console.log(son.parentNode); 
        console.log(son.offsetParent);

    </script>
</body>
</html>